Upper Green River Basin (11)
February 2002

Snow
The Upper Green River Basin snow water equivalent (SWE), above Fontenelle Reservoir, is 82 percent
of average (132 percent of last year). The Green River basin SWE above Warren Bridge is 84 percent
of normal (138 percent of last year). SWE on the west side of the Upper Green River basin is about 80
percent of normal, 137 percent of this time last year. Newfork River SWE is now 84 percent of normal
(109 percent of last year). Big Sandy-Eden Valley SWE is about 89 percent of average (131 percent of
last year). For more information see the Basin Summary of Snow Courses at the beginning of this
report.

Precipitation
The 11 reporting precipitation sites in the basin were 60 percent of last month's average . Precipitation
varied from 46 to 79 percent of average. Water year-to-date precipitation is about 87 percent of average
(134 percent of last year). Year to date percentage of average ranges from 79 to 95 percent for the
reporting stations.

Reservoir
Big Sandy Reservoir is currently storing 3,100 acre feet (17 percent of average) -- 14 percent of last
year and 8 percent of capacity. Eden Reservoir is currently storing 480 acre feet (15 percent of average)
-- 4 percent of capacity. Fontenelle Reservoir is storing 141,200 acre-feet (77 percent of average and 41
percent of the total capacity). Flaming Gorge Reservoir is currently storing 2,854,100 acre feet (96
percent of average) -- 95 percent of last year and 72 percent of capacity. Detailed reservoir data is
shown on the following page and on the reservoir storage summary at the beginning of this report.

Streamflow
The following forecast is based on the fifty-percent chance April through July runoff in the Upper
Green River basin. Runoff is forecast to be below average. Green River at Warren Bridge is expected
to yield about 215,000 acre-feet (81 percent of normal). Pine Creek above Fremont Lake is expected to
yield 82,000 acre-feet (79 percent of normal). New Fork River near Big Piney is expected to yield
about 290,000 acre-feet (73 percent of normal). Fontenelle Reservoir Inflow is estimated to be 590,000
acre-feet (69 percent of average), and Big Sandy near Farson is expected to be about 46,000 acre-feet
(79 percent of normal).